What is ULTK leather?

Question

in referance to soccer cleats?

Answer 1

ULT-K leather is just the fancy name for calf-skin leather. It's very similar to kangaroo leather. Adidas uses both leathers [plus full/multi grain leathers and synthetics] for their famous Predators.  

Answer 2

There is actually no such thing as Ult K-Leather. It is just really soft calf skin. If you were to get a boot specifically for the leather then this is the second best type of leather you can get behind Kangaroo Leather, Ult K is much cheaper than K-Leather though.